For decades, scientists have been pursuing an exceedingly ambitious goal: They hope to provide clean energy for the entire world. Solutions including fusion, wind, solar and more are all in the works, each with their own sets of promises and costs.   Frederik C. Krebs, CEO of infinityPV, sees one clear path to a renewable energy future: “Printed solar cells hold the promises of solving our energy needs – we have the technology, all needed materials are abundant, and we spend extremely limited ...